Transmitter



(No Model.) l

' R. W. WHITNEY 86 F. PULTZ.

TRANSMITTER.

Patented Deo. 6, 1887.

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' UNITED STATES PATENT OFFICE..

RUEL W. W'HITN EY ANDFREDERICK PULTZ, OF CLEVELAND, OHIO.

TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 374,439, dated December 6, 185.7.

Application led May 3l, 1887.

States, residing at Cleveland, in the county of Cuyahoga, State ofOhio, have invented vcertain new and useful Improvements in Trans mitters, of which the following is a specification, reference being had therein to the accompanying drawings.

The object of this invention is to provide a supplemental mouth-piece for telephonetransmitters and other voice-transmitting medium-such as speaking-tubes, eartrumpets, Ste-and to provide the same with means whereby the volume of sound emitted from the speaker is diffused into regularly-distributed sound-waves before coming into contact with the transmittingdiaphragm.

Other objects and advantages of the invention will hereinafter be described, and the y,

novel features will be particularly pointed out in the claims.

Referring to the drawings, Figure l is a perspective of a telephone, the transmitter of which :is provided with our supplemental mouth-piece; and Fig. 2 is a central vertical section of the mouth-piece and its connectingplate.

Similar letters of reference indicate like parts in both figures of the drawings.

Incarrying out our invention We prefer to construct the same of gatta-percha; but it is evident that sheet metal may be used and the same results will be attained.

A represents our supplemental mouthpiece, which is flared at its outer end, as usual, and contracted at its inner or rear end. A plate, B, provided with an opening, B', is in this instance secured to said mouth-piece, the rear end of the latter passing through said opening and being turned to form a securingflange, A. The two opposite sides of the plate B are turned to form securing eyes or clips B2, and through these are passed, preferably, spring clamping-wires B, the ends of which are bent and adapted to embrace the sides of the telephone-transmitter C, and thus retain the mouth-piece in position over the diaphragm .of the telephone.

Located within the mouth-piece A, at a Serial No. 239,750. (No model.)

suitable distance from its rear end, is a re ticulated or perforated supplemental diaphragm, D, in this instance formed of reticulated wire or gauze of a mesh best adapted for the pprpose. This diaphragm may be held in place by any suitable retaining devices, and in this instance I have formed the mouth-piece with an annular groove, A2, for its reception and retention. By this construction, no matter how close the speaker is to the transmitter or how great the volume of sound emitted, it will be diffused into regular even sound-waves, and will thus be presented to the inner diaphragm of the transmitter. Instead of coming in contact with the same at one particular point and rendering the transmission indistinct, it will be `evenly distributed over the entire surface thereof, and each articulation clearly transmitted.

mouth-piece, minus the securing-plate, may be attached to speakingtubes, ear-trumpets, 8vo., and although no second diaphragm is acted upon by the sound-waves, yet good results are attained by the addition of the reticulated diaphragm described.

` Having described our invention and its operation, what We claim is- 1. An independent mouthpiece for telephone-transmitters, provided with a reticulated or. perforated diaphragm for diffusing and equally presenting the sound-Waves, substantially as speciiied.

2. The combination, with a telephone-transmitter, of an independent mouth-piece mounted thereon and comprising a conical tube having a reticulated or perforated diaphragm therein for diffusing and equally presenting sound-Waves to the transmitter, substantially as specified.

3. The combination', with the transmitter of a telephone, of asupplemental mouth-piece mounted on a plate and provided with a reticulated or perforated diaphragm for diffusing and` equally presenting the sound-waves tothe surface of the transmitter-diaphragm, and of clamping-arms secured to said plate andl adapted to embrace the edges of said transmitter, substantially as specied.

4. The mouth-piece A, provided with the As shown by dotted nues in Eig. 2, the

IOO

internal annular groove, A2, and having the In testimony whereof we afiix our signatures diaphragm D, seated in said groove, substanin presence of two Witnesses. tially as specified.

.RUEL W. VHITNEY 5. The mouth-piece A, having the dlaphragm D seated therein, and anged, as al; FREDERICK PULTZ A', the plate B, having the opening B', and Witnesses:

secnringarmsBs, in combination with a trans- S. F. ADAMS,

mittel', substantially as specified. l W. C. WILSON. 

